US4022270A - Fire detector scanning arrangement - Google Patents

Fire detector scanning arrangement Download PDF

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Publication number
US4022270A
US4022270A US05/658,147 US65814776A US4022270A US 4022270 A US4022270 A US 4022270A US 65814776 A US65814776 A US 65814776A US 4022270 A US4022270 A US 4022270A
Authority
US
United States
Prior art keywords
infra
detector
heat exchanger
fluid
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/658,147
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English (en)
Inventor
Richard Franklin Stockman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Power Inc
Original Assignee
Air Preheater Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Preheater Co Inc filed Critical Air Preheater Co Inc
Priority to US05/658,147 priority Critical patent/US4022270A/en
Priority to CA266,491A priority patent/CA1084607A/en
Priority to MX167969A priority patent/MX143211A/es
Priority to ES455890A priority patent/ES455890A1/es
Priority to BR7700924A priority patent/BR7700924A/pt
Priority to FR7704425A priority patent/FR2341845A1/fr
Priority to JP1508377A priority patent/JPS5299454A/ja
Priority to OA56075A priority patent/OA05573A/xx
Application granted granted Critical
Publication of US4022270A publication Critical patent/US4022270A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus

Definitions

  • a mass of heat exchange material commonly comprised of packed element plates that form a heat absorbent matrix are positioned in a hot gas passageway to absorb heat from hot gases passing therethrough. After the plates become heated by the hot gas they are suspended in a passageway for cool air where the heated plates transfer their absorbed heat to the cool air flowing therethrough.
  • fly ash and unburned products of combustion carried by the exhaust gas are deposited on the surface of the packed element plates, and these deposits continue to be deposited and to build up until air and gas flow through the heat exchanger is substantially stopped. Heat is then generated in the element itself until the deposits begin to glow and cause a "hot-spot," that if not detected will rapidly increase even more until the metal of the heat exchanger will itself ignite and cause a catastrophic fire.
  • This invention therefore relates to a detector of infra-red rays emanating from the matrix of rotary regenerative heat exchange apparatus that is used to transfer heat from hot exhaust gas to cooler air to be heated.
  • the chief objective of the invention is to provide an infra-red ray detecting apparatus adapted to be intermittently disposed in the apparatus and in the ambient air in such a manner that it may be periodically cleaned without removal from the heat exchanger.
  • FIG. 1 is a perspective view of a rotary regenerative heat exchanger that includes the apparatus of the invention
  • FIG. 2 is an enlarged top plan view of the detectors shown in FIG. 1,
  • FIG. 3 is an enlarged top plan view of the infra-red detectors of FIG. 1 moved to a "closed" position
  • FIG. 4 is a sectional view of the device as seen from line 4--4 of FIG. 1.
  • a rotary regenerative air preheater comprises a cylindrical housing 10 that encloses a rotor including a cylindrical casing 14 made up of a series of compartments formed by radial partitions 16 extending between the casing 14 and a central rotor post 15.
  • the compartments each contain a mass of heat absorbent material 17 in the form of corrugated plates of the like that provide passageways for the flow of fluid therebetween.
  • the rotor is rotated slowly about its axis by a motor 20 to advance the heat absorbent element contained by the compartments of the rotor alternately between a heating fluid and a fluid to be heated.
  • the heat absorbent plates 17 absorb heat from the heating fluid entering duct 26 of the heat exchanger from a furnace or other source of heat, and they transmit the absorbed heat to a fluid such as cool air entering the heat exchanger through a duct 28. After passing over the heated material and absorbing heat therefrom, the heated fluid is discharged through duct 32 to a boiler furnace or other place of use.
  • this invention is directed to apparatus that will detect a relatively small increase in temperature and the occurrence of such a "hot-spot" in the rotor of a heat exchanger well before a disastrous fire actually occurs.
  • a plurality of detectors 36 sinsitive to the variation of infra-red rays are positioned at the ends of lever arms 38.
  • the lever arms are themselves each pivotally mounted in a gear box 42 at the side of the rotor housing in such a manner that they swing out in unison and together face the rotor as it rotates upon its axis or swing back into enclosure 40.
  • An actuating arm 46 extends back from each box 42 a predetermined distance where it is pivotally attached at 48 to a reciprocating linkage 52, the linkage 52 being moved slowly forward and backward by any suitable prime mover 55.
  • the levers 38 swing out to permit detectors 36 to "view” the adjacent rotor, but when the actuating linkage 52 is moved oppositely, the levers move in reverse to an "at rest” position where housing members 40 enclose the detectors 36.
  • the enclosures 40 have a removable door 62 over an open side that covers opening 54 in plate 35, while a sealing ring 58 precludes the flow of fluid, when the detector 36 is drawn tightly thereto.
  • each detector 36 includes a viewing lens that is adapted to be positioned in the flowing fluid to confront the matrix and view the infra-red rays being emitted thereby, each lens is also continuously being subjected to the contaminants carried by said fluid.
  • the lens quickly becomes clouded so that the ray transmission of the lens and the sensitivity of the detector is quickly reduced.
  • the linkage 52 is then actuated and the housing members 44 with the detectors 36 therein are moved into the openings 54 to comprise a side of enclosures 40.
  • the sealing rings 58 preclude fluid flow therethrough so the door 62 may be opened and the particular detector to be serviced may be removed from the housing 44. After cleaning, replacement or repair of the detector 36, the door 62 is closed and operation of the detector resumed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Radiation Pyrometers (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
US05/658,147 1976-02-17 1976-02-17 Fire detector scanning arrangement Expired - Lifetime US4022270A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US05/658,147 US4022270A (en) 1976-02-17 1976-02-17 Fire detector scanning arrangement
CA266,491A CA1084607A (en) 1976-02-17 1976-11-24 Fire detector scanning arrangement
MX167969A MX143211A (es) 1976-02-17 1977-02-08 Mejoras a un sistema detector de incendios para un intercambiador de calor regenerado
ES455890A ES455890A1 (es) 1976-02-17 1977-02-14 Perfeccinamientos introducidos en los cambiadores termicos.
BR7700924A BR7700924A (pt) 1976-02-17 1977-02-15 Permutador de calor
FR7704425A FR2341845A1 (fr) 1976-02-17 1977-02-16 Echangeur de chaleur contenant un detecteur de rayons infrarouges servant a deceler les points chauds
JP1508377A JPS5299454A (en) 1976-02-17 1977-02-16 Heat exchanger
OA56075A OA05573A (fr) 1976-02-17 1977-02-17 Détecteur de rayons infrarouges.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/658,147 US4022270A (en) 1976-02-17 1976-02-17 Fire detector scanning arrangement

Publications (1)

Publication Number Publication Date
US4022270A true US4022270A (en) 1977-05-10

Family

ID=24640094

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/658,147 Expired - Lifetime US4022270A (en) 1976-02-17 1976-02-17 Fire detector scanning arrangement

Country Status (8)

Country Link
US (1) US4022270A (enrdf_load_stackoverflow)
JP (1) JPS5299454A (enrdf_load_stackoverflow)
BR (1) BR7700924A (enrdf_load_stackoverflow)
CA (1) CA1084607A (enrdf_load_stackoverflow)
ES (1) ES455890A1 (enrdf_load_stackoverflow)
FR (1) FR2341845A1 (enrdf_load_stackoverflow)
MX (1) MX143211A (enrdf_load_stackoverflow)
OA (1) OA05573A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192372A (en) * 1978-08-03 1980-03-11 The Air Preheater Company, Inc. Adjustable lever for fire detection system
US4249413A (en) * 1977-11-22 1981-02-10 Electricite De France (Service National) Method and device for locating a defective tube in a steam generator tube bundle
FR2463906A1 (fr) * 1979-08-20 1981-02-27 Svenska Rotor Maskiner Ab Echangeur de chaleur a levier reglable utilisable notamment pour la detection des incendies
US4383572A (en) * 1981-12-07 1983-05-17 The Air Preheater Company, Inc. Fire detection cleaning arrangement
EP0250743A1 (en) * 1986-06-23 1988-01-07 The Air Preheater Company, Inc. Apparatus for detecting hot spots in a rotary heat exchanger
US4823861A (en) * 1988-09-06 1989-04-25 The Babcock & Wilcox Company Fire detection device for regenerative air heater
US5097889A (en) * 1991-01-11 1992-03-24 Abb Air Preheater, Inc. Hot spot detection and supression system
US5762128A (en) * 1996-11-15 1998-06-09 Abb Air Preheater, Inc. On-line regenerative air preheater fouling sensing system
US5791400A (en) * 1996-07-01 1998-08-11 Abb Air Preheater, Inc. Linear scan hot spot detection system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181602A (en) * 1961-06-05 1965-05-04 Davidson & Co Ltd Heat exchangers
CA710205A (en) * 1965-05-25 Stockman Richard Retractable cleaner for regenerative heat exchanger
GB1126466A (en) * 1964-09-21 1968-09-05 Howden James & Co Ltd Improvements in or relating to preheaters
US3730259A (en) * 1972-03-02 1973-05-01 Air Preheater Hot-spot detector for heat exchanger
US3861458A (en) * 1973-06-04 1975-01-21 Air Preheater Multi-head infra-red ray detector
US3918516A (en) * 1971-11-02 1975-11-11 Alsthom Cgee Gas heat exchanger unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1210333A (fr) * 1958-09-19 1960-03-08 Babcock & Wilcox France Dispositif détecteur d'incendie dans un réchauffeur d'air rotatif à régénération, du type ljungstrom
US3183961A (en) * 1960-09-08 1965-05-18 Brandt Herbert Method and apparatus for controlling the temperature and humidity of a regenerative air-heater
FR1401424A (fr) * 1964-04-24 1965-06-04 Glaces De Boussois Procédé et dispositif pour conserver la transparence des pièces optiques en atmosphère salissante
FR1452367A (fr) * 1965-10-22 1966-02-25 Bailey Meter Co Appareil détecteur à distance d'un champ radiant notamment pour le contrôle d'uneflamme
FR1577961A (enrdf_load_stackoverflow) * 1968-04-11 1969-08-14

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA710205A (en) * 1965-05-25 Stockman Richard Retractable cleaner for regenerative heat exchanger
US3181602A (en) * 1961-06-05 1965-05-04 Davidson & Co Ltd Heat exchangers
GB1126466A (en) * 1964-09-21 1968-09-05 Howden James & Co Ltd Improvements in or relating to preheaters
US3918516A (en) * 1971-11-02 1975-11-11 Alsthom Cgee Gas heat exchanger unit
US3730259A (en) * 1972-03-02 1973-05-01 Air Preheater Hot-spot detector for heat exchanger
US3861458A (en) * 1973-06-04 1975-01-21 Air Preheater Multi-head infra-red ray detector

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249413A (en) * 1977-11-22 1981-02-10 Electricite De France (Service National) Method and device for locating a defective tube in a steam generator tube bundle
US4192372A (en) * 1978-08-03 1980-03-11 The Air Preheater Company, Inc. Adjustable lever for fire detection system
FR2463906A1 (fr) * 1979-08-20 1981-02-27 Svenska Rotor Maskiner Ab Echangeur de chaleur a levier reglable utilisable notamment pour la detection des incendies
US4383572A (en) * 1981-12-07 1983-05-17 The Air Preheater Company, Inc. Fire detection cleaning arrangement
EP0250743A1 (en) * 1986-06-23 1988-01-07 The Air Preheater Company, Inc. Apparatus for detecting hot spots in a rotary heat exchanger
US4813003A (en) * 1986-06-23 1989-03-14 Air Preheater Company, Inc. Method of detecting hot spots in a rotary heat exchanger
US4823861A (en) * 1988-09-06 1989-04-25 The Babcock & Wilcox Company Fire detection device for regenerative air heater
US5097889A (en) * 1991-01-11 1992-03-24 Abb Air Preheater, Inc. Hot spot detection and supression system
US5791400A (en) * 1996-07-01 1998-08-11 Abb Air Preheater, Inc. Linear scan hot spot detection system
US5762128A (en) * 1996-11-15 1998-06-09 Abb Air Preheater, Inc. On-line regenerative air preheater fouling sensing system

Also Published As

Publication number Publication date
JPS5535633B2 (enrdf_load_stackoverflow) 1980-09-16
FR2341845A1 (fr) 1977-09-16
OA05573A (fr) 1981-04-30
CA1084607A (en) 1980-08-26
FR2341845B1 (enrdf_load_stackoverflow) 1981-06-12
ES455890A1 (es) 1978-11-01
MX143211A (es) 1981-04-02
JPS5299454A (en) 1977-08-20
BR7700924A (pt) 1977-10-18

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